| Company Name | Software Titles |
|---|---|
| Z-Systems | 2 |
| Zabaware | 1 |
| Zabkat | 2 |
| Zango | 5 |
| zanox AG | 1 |
| ZANOX.de AG | 1 |
| ZANTAZ | 1 |
| zapappindia | 2 |
| Zattoo | 2 |
| Zaval CE Group | 1 |
| zbgk | 1 |
| ZbSoft | 1 |
| ZD Soft | 2 |
| ZDT | 1 |
| Zeacom | 7 |
| Zeataline Projects Limited | 1 |
| Zebra | 14 |
| Zebra Technologies | 1 |
| Zeiss | 5 |
| Zeitnitz | 1 |
| Zelek Software | 1 |
| Zend Technologies | 14 |
| Zenilink Media | 1 |
| Zenith | 1 |
| Zenith Infotech | 6 |
| Zenith Technology Limited | 1 |
| ZenJu | 1 |
| Zenographics | 1 |
| Zenturi | 1 |
| Zenwerx Custom Programming | 1 |
| Zeon | 1 |
| Zephyr | 1 |
| ZeraWare | 1 |
| Zero-Knowledge Systems | 1 |
| ZeroSPAM | 1 |
| Zevez | 1 |
| Zhengpeng Hou | 1 |
| ZhiQing Soft | 1 |
| Zidsoft | 1 |
| Ziff-Davis Media | 7 |
| ZillaTube | 1 |
| ZIM | 1 |
| Zimbra | 3 |
| Zinio | 4 |
| Zion Software | 1 |
| Zipclix | 1 |
| ZipGenius | 1 |
| Zittware | 1 |
| ZiWu-Soft EDV Systeme GmbH | 1 |
| ZixCorp | 5 |